Civil structures have to meet the application requirements. Among others, the structures have to work properly during ordinary conditions without, e. g., over-deformation, vibration and large crack, which the users may feel uncomfortable with. Hence, it is required to monitor the occurrence of cracks and track the growth of them, and subsequently the width of cracks can be obtained. This is a long time unsolved issue in civil engineering. In this paper, we use fiber Bragg grating (FBG) sensors to investigate a reinforced concrete frame-shear wall structure during vibration test. FBG sensors are able to monitor the occurrence and growth of cracks till the failure of the structure. It is thus demonstrated the capability of this technique as an effective and reliable approach for structure monitoring.
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